Battery Group Size Chart [All Notes In One Place!]

Every journey matters with your vehicle so that the batteries that power them up remain in top condition. Here comes the importance of correct battery size, as it is a must for the perfect performance of the vehicles. The battery group size chart plays the most crucial in assisting vehicle ownership.

BCI, or Battery Council International, sets the standard for battery weights, dimensions & testing procedures. The EN & DIN cross reference chart also assigns battery group size. Knowing the exact battery group size helps to find the new battery for replacement.

But just knowing the group size is not enough. There are many more things that you should know about this matter. That is why we recommend you stay to see every nook & corner of the matter.

Most Common Battery Group Size Chart [A Quick Review]

As you know, as the batteries’ size differs based on the various types of vehicles, knowing the correct battery size is crucial. This is because the wrong one won’t be able to recharge with your vehicle’s alternator.

That’s why the chart of BCI’s most common battery group size is below for a quick review.

Group Size Batteries	Millimeters			Centimeters			Inches
	L	W	H	L	W	H	L	W	H
Group 24	260	173	225	26	17.3	22.5	10.25	6.8125	8.875
Group 27	306	173	225	30.6	17.3	22.5	12.0625	6.8125	8.875
Group 31	330	173	240	33	17.3	24	13	6.8125	9.4375
Group 34	260	173	200	26	17.3	20	10.25	6.8125	7.875
Group 35	230	175	225	23	17.5	22.5	9.0625	6.875	8.875
Group 51 & 51R	238	129	223	23.8	12.9	22.3	9.374	5.0625	8.8125
Group 65	306	190	192	30.6	19	19.2	12.0625	7.5	7.5625
Group 78	260	179	196	26	17.9	19.6	10.25	7.0625	7.6875

BCI Battery Group Size Chart [Every Pinpoint]

BCI is the most common system for classifying the different types of batteries. The chart below highlights all the battery groups of BCI associated with their specification.

Passenger Car & Light Commercial Batteries [12 Volt & 6 Cells]

BCI Group Size Battery	Inches			Millimeters
	L	W	H	L	W	H
21	8 3/16	6 13/16	8 3/4	208	173	222
21R	8 3/16	6 13/16	8 3/4	208	173	222
22F	9 1/2	6 7/8	8 5/16	241	175	211
22HF	9 1/2	6 7/8	9	241	175	229
22NF	9 7/16	5 1/2	8 15/16	240	140	227
22R	9	6 7/8	8 5/16	229	175	211
24	10 1/4	6 13/16	8 7/8	260	173	225
24F	10 3/4	6 13/16	9	273	173	229
24H	10 1/4	6 13/16	9 3/8	260	173	238
24R	10 1/4	6 13/16	9	260	173	229
24T	10 1/4	6 13/16	9 3/4	260	173	248
25	9 1/16	6 7/8	8 7/8	230	175	225
26	8 3/16	6 13/16	7 3/4	208	173	197
26R	8 3/16	6 13/16	7 3/4	208	173	197
27	12 1/16	6 13/16	8 7/8	306	173	225
27F	12 1/2	6 13/16	8 15/16	318	173	227
27H	11 3/4	6 13/16	9 1/4	298	173	235
29NF	13	5 1/2	8 15/16	330	140	227
33	13 5/16	6 13/16	9 3/8	338	173	238
34	10 1/4	6 13/16	7 7/8	260	173	200
34R	10 1/4	6 13/16	7 7/8	260	173	200
35	9 1/16	6 7/8	8 7/8	230	175	225
36R	10 3/8	7 1/4	8 1/8	263	183	206
40R	11	6 15/16	6 15/16	278	175	175
41	11 9/16	6 15/16	6 15/16	293	175	175
42	9 9/16	6 15/16	6 15/16	242	175	175
43	13 1/8	6 7/8	8 1/16	334	175	205
45	9 7/16	5 1/2	8 15/16	240	140	227
46	10 3/4	6 13/16	9	273	173	229
47	9 11/16	6 7/8	7 1/2	246	175	190
48	12 1/16	6 7/8	7 9/16	306	175	192
49	15	6 7/8	7 3/16	381	175	192
50	13 1/2	5	10	343	127	254
51	9 3/8	5 1/16	8 13/16	238	129	223
51R	9 3/8	5 1/16	8 13/16	238	129	223
52	7 5/16	5 13/16	8 1/4	186	147	210
53	13	4 11/16	8 1/4	330	119	210
54	7 5/16	6 1/16	8 3/8	186	154	212
55	8 5/8	6 1/16	8 3/8	218	154	212
56	10	6 1/16	8 3/8	254	154	212
57	8 1/16	7 3/16	6 15/16	205	183	177
58	10 1/16	7 3/16	6 15/16	255	183	177
58R	10 1/16	7 3/16	6 15/16	255	183	177
59	10 1/16	7 5/8	7 3/4	255	193	196
60	13 1/16	6 5/16	8 7/8	332	160	225
61	7 9/16	6 3/8	8 7/8	192	162	225
62	8 7/8	6 3/8	8 7/8	225	162	225
63	10 3/16	6 3/8	8 7/8	258	162	225
64	11 11/16	6 3/8	8 7/8	296	162	225
65	12 1/16	7 1/2	7 9/16	306	190	192
70	8 3/16	7 1/16	7 11/16	208	179	196
71	8 3/16	7 1/16	8 1/2	208	179	216
72	9 1/16	7 1/16	8 1/4	230	179	210
73	9 1/16	7 1/16	8 1/2	230	179	216
74	10 1/4	7 1/4	8 3/4	260	184	222
75	9 1/16	7 1/16	7 11/16	230	179	196
76	13 1/8	7 1/16	8 1/2	334	179	216
78	10 1/4	7 1/16	7 11/16	260	179	196
85	9 1/16	6 13/16	8	230	173	203
86	9 1/16	6 13/16	8	230	173	203
90	9 11/16	6 7/8	6 7/8	246	175	175
91	11	6 7/8	6 7/8	280	175	175
92	12 1/2	6 7/8	6 7/8	317	175	175
93	15	6 7/8	6 7/8	354	175	175
94R	12 3/8	6 7/8	7 1/2	315	175	190
95R	15 9/16	6 7/8	7 1/2	394	175	190
96R	9 1/2	6 15/16	6 15/16	242	175	175
97R	9 15/16	6 7/8	7 1/2	252	175	190
98R	11 3/16	6 7/8	7 1/2	283	175	190
99	8 1/8	6 7/8	6 7/8	207	175	175
99R	8 1/4	6 7/8	6 7/8	210	175	175
100	10 1/4	7 1/16	7 3/8	260	179	188
101	10 1/4	7 1/16	6 11/16	260	179	170
121R	8 1/4	7	8 1/2	208	177	215
124	10 7/16	6 7/8	8 7/16	265	175	214
124R	10 3/8	7	8 5/16	262	177	218
151R	7 3/8	4 15/16	8 7/8	188	125	225

Passenger Car & Light Commercial Batteries [6 Volt & 3 Cells]

BCI Group Size Battery	Inches			Millimeters
	L	W	H	L	W	H
1	9 1/8	7 1/8	9 3/8	232	181	238
2	10 3/8	7 1/8	9 3/8	264	181	238
2E	19 7/16	4 1/8	9 1/8	492	105	232
2N	10	5 9/16	8 15/16	254	141	227
17HF	7 3/8	6 7/8	9	187	175	229
19L	8 1/2	7	7 1/2	216	178	191

Heavy Duty Commercial & Special Tractor Batteries [12 Volts & 6 Cells]

BCI Group Size Batteries	Inches			Millimeters
	L	W	H	L	W	H
3EE	19 5/16	4 3/8	8 7/8	491	111	225
3ET	19 5/16	4 3/8	9 13/16	491	111	249
4D	20 3/4	8 3/4	9 7/8	527	222	250
4DLT	20	8 3/16	7 15/16	508	208	202
6D	20 3/4	10	10 1/4	527	254	260
8D	20 3/4	11 1/8	9 7/8	527	283	250
12T	7 1/16	6 15/16	7 15/16	179	177	202
28	10 5/16	6 13/16	9 7/16	261	173	240
29H	13 1/8	6 3/4	9 1/8	334	171	232
30H	13 1/2	6 13/16	9 1/4	343	173	235
31	13	6 13/16	9 7/16	330	173	240

Heavy Duty Commercial & Special Tractor Batteries [6 Volt & 3 Cells]

BCI Group Size Batteries	Inches			Millimeters
	L	W	H	L	W	H
3	11 3/4	7 1/8	9 3/8	298	181	238
3EH	19 5/16	4 3/8	9 13/16	491	111	249
4	13 1/8	7 1/8	9 3/8	334	181	238
4EH	19 5/16	5	9 13/16	491	127	249
5D	13 3/4	7 1/8	9 3/8	349	181	238
7D	16 1/4	7 1/8	9 3/8	413	181	238

Electric Vehicle Batteries [6 Volt & 3 Cells]

BCI Group Size Batteries	Inches			Millimeters
	L	W	H	L	W	H
Group GC2	10 3/8	7 3/16	10 5/8	264	183	270
Group GC2H	10 3/8	7 3/16	11 5/8	264	183	295

Electric Vehicle Batteries [8 Volt & 4 Cells]

BCI Group Size Batteries	Inches			Millimeters
	L	W	H	L	W	H
Group GC8	10 3/8	7 3/16	10 7/8	264	183	277
Group GC8H	10 3/8	7 3/16	11 5/8	264	183	295

Electric Vehicle Batteries [12 Volt & 6 Cells]

BCI Group Size Batteries	Inches			Millimeters
	L	W	H	L	W	H
Group GC12	12 7/8	7 3/16	10 7/8	327	183	277

General Purpose Batteries [12 Volt & 6 Cells]

BCI Group Size Batteries	Inches			Millimeters
	L	W	H	L	W	H
Group U1	7 3/4	5 3/16	7 5/16	197	132	186
Group U1R	7 3/4	5 3/16	7 5/16	197	132	186
U2	6 5/16	5 3/16	7 1/8	160	132	181

Ordnance Batteries [12 Volt & 6 Cells]

BCI Group Size Batteries	Inches			Millimeters
	L	W	H	L	W	H
2H	10 1/4	5 5/16	8 15/16	260	135	227
6T	11 1/4	10 1/2	9 1/16	286	267	230

Ordnance Batteries [24 Volt & 12 Cells]

BCI Group Size Batteries	Inches			Millimeters
	L	H	W	L	H	W
4H	10 3/4	10 5/16	9	273	262	229

BCI Battery Groups With DN & EN Codes [Cross Reference Chart]

The DIN & EN are another classification system of battery groups that you may see in the vehicle’s user manual or while buying a new one. You can use the classification chart [listed below] if you are still looking for the right one.

BCI Group	Millimeter			Inches			EN Codes	DIN Codes
	L	H	W	L	H	W
99R	210	175	175	8 1/4	6 7/8	6 7/8	36LB	T4, LB1
99	207	175	175	8 1/8	6 7/8	6 7/8	36LB	T4, LB1
98R	283	175	190	11 3/16	6 7/8	7 1/2	66L3	H6, L3
97R	252	175	190	9 15/16	6 7/8	7 1/2	55L2	H5, L2
95R	394	175	190	15 9/16	6 7/8	7 1/2	–	H9, L6
94R	315	175	190	12 3/8	6 7/8	7 1/2	77L4	H7, L4
93	354	175	175	15	6 7/8	6 7/8	88LB	T8, LB5
92	315	175	175	12 1/2	6 7/8	6 7/8	77LB	T7, LB4
91	278	175	175	11	6 7/8	6 7/8	66LB	T6, LB3
90	242	175	175	9 11/16	6 7/8	6 7/8	45LB	T5, LB2
49	354	175	190	15	6 7/8	7 3/16	88L5	H8, L5
48	278	175	190	12 1/16	6 7/8	7 9/16	66L3	H6, L3
47	242	175	190	9 11/16	6 7/8	7 1/2	55L2	H5, L2
42	242	175	175	9 5/16	6 13/16	6 13/16	45LB	T5, LB2
41	293	175	175	11 3/16	6 7/8	6 7/8	54LB	T65
40R	278	175	175	10 15/16	6 7/8	6 7/8	66LB	T6, LB3

Dimensions, Features & Recommendation Of Different Group Size Batteries

Not only are the sizes of the battery groups different, but they also differ in features & recommendations. Here are highlighted the features, dimensions & recommendations of the most common battery groups.

Batteries Of 24 Group

BCI 24 battery group is the most general-purpose battery & common for the UPS system, security & medical system & industrial appliances. They are best to be used in the float or deep application.

You must be careful when choosing a 24-battery group as the group has a slight dimension difference.

Batteries Of 27 Group

Group 27 battery is a powerful battery featuring a 20h capacity. The battery provides CCA 600-1000, RC 140-220 minutes & weight ranges between 54 & 70 pounds.

Group 27F, group 27H & group 27 are very similar battery groups. Often, they are labeled as group 27 batteries.

Get to Know the difference: Group 24 vs Group 27 Deep Cycle Battery

Batteries Of 31 Group

Group 31 batteries are relatively powerful & large batteries. The battery group is standard for marine, off-grid, automotive & similar applications. It featured with

• CCA- 750-1250
• 150-250 minutes
• 20h capacity
• 75-125 Ah range

Batteries Of 34 Group

Group 34 batteries are powerful but medium-large. It is mainly used in marine, off-the-grid applications, industrial & automotive. The battery group is featured with 20h capacity providing

• 50-75 Ah range
• Reserve Capacity 100-145 minutes
• 750-900 CCA
• 37 and 51 pounds in weight [depend on battery type]

Batteries Of 35 Group

Among the lead acid batteries, the 35 group is the most common & primarily used in trucks, RVs & cars as dual-purpose or starting batteries [more as dual purpose. The popular 35 batteries are AGM Absorbent Glass Mat or SLA Sealed Lead Acid batteries.

Batteries Of 58 & 58R Group

Group 58 & 58R batteries are mid-size cranking batteries. They are mostly used in sedans, SUVs & some passenger cars & even in boats. Both groups share almost similar dimensions.

Many brands offer some batteries of these groups that are internally different. Besides, group 58R batteries have more discharge characteristics than group 58 batteries.

Batteries Of 65 Group

Group 65 are mid-size batteries commonly used in marine, automotive & industrial batteries. The battery group is often designed as AGM batteries of dual purpose. Group 65 batteries are featured with-

• 20h capacity with 70-75 Ah
• 20h capacity
• 130-150 minutes RC
• 750-950 CCA
• 1100 Amps MCA values
• 45 and 55 pounds in weight

Batteries Of 78 Group

Group 78 batteries are used in cars and light trucks, as well as light industrial applications and marine starting. The battery is generally used for dual-purpose & ‘Stop-and-Go’ automotive applications. Such applications need durable and tough & high-quality batteries.

Common Battery Group Sizes By Different Vehicle Types [Choose According To Your Vehicle]

BCI groups sizes have different types, sizes & dimensions for different batteries. The battery group sizes assist you in understanding the battery sizes used in various vehicles. Here are the most common battery groups for different vehicles.

Vehicle Type	Battery Groups
Passenger cars [Automotive battery groups]	24, 24F, 27, 34, 35, 65, 78, H6 [48] & H9 [49]
Bike, Motorcycles & Powersports	Lead-acid motorcycle battery destination: 12N, G, C, Y, GB, YB & CB Maintenance free motorcycle battery destination: GTX, CTX & YTX
Battery groups for light trucks	19L, 17HF, 2N, 2E, 2 & 1
Battery groups for big trucks	3 cells: 7D, 5D, 4EH, 4, 3EH & 3  6 cells: 31, 30H, 29H, 28, 12T, 8D, 6D, 4DLT, 4D, 3ET & 3EE
Electric or Hybrid cars battery groups	GC2, CG2H, GC8, GC12 & GC8H
Battery groups for Marine, boats & yachts	34, 31, 27, 8D & 4D
Battery groups for lawn mower	U1, U1R & U2

What Is The Size Of The Battery For My Car?

Physical size, terminal orientation, and cranking AMP size are the three basic characteristics of the battery. The physical size [referred to in the chart] must be a perfect fit in the battery tray or terminal.

You can look at the battery label on the top of the original battery of your battery to know the group size. It will assist you in finding the physical size of the battery that your application needs.

The next thing you need to consider is your vehicle’s cranking & cold amp. You can also look at the battery label for it.

The cranking amps measured at 0 degrees Celsius or 32 degrees Fahrenheit, whereas the cold amps measured at 18 degrees Celsius or 0 degrees Fahrenheit.

If the climate of your dwelling place never goes below the 32-degree Fahrenheit, then the cranking amps should be your main concern.

You can measure the original battery tray or box to determine the size of your battery if you don’t have the application’s original battery or have lost the top label. Then you can use the group size chart of the battery to figure out the battery you need.

Frequently Asked Questions

In this subsection, we will highlight several mostly searched queries about the battery you would also like to know. Take a look for more & better knowledge.

Are Group 27 and 31 Batteries the Same Size?

The BCI 27 battery group is almost like the group 31 batteries. They have practically the same specifications & dimensions. But there can be little difference as group 27 is slightly shorter in height & length than group 31.

Does Group Size Matter on A Battery?

Yes, the group size matters on a battery. The battery’s group size is set as the standard of the battery sizes based on the model, make, and engine type.

Besides, one type of vehicle can fit more than one type of battery group. You should know the correct one that the vehicle approved as the wrong one can result in low capacity & voltage.

Which Is a Better Group 24 or 27 Battery?

The BCI 24 group battery is more known as it lasts longer than the 27 groups. Besides, the group has a lower discharge rate. Group 24 has a higher capacity than the BCI 27 battery group.

What Happens if I Use the Wrong Group-Size Battery?

You may underperform in your vehicle if you use the wrong group-size battery. Besides, wrong group size batteries used in the car can lead to significant and permanent damage.

That’s why it is always necessary to know the approved battery size of your vehicle & replace the battery with the correct one.

Which Battery Is the Most Powerful, 24 or 35?

The RC rating for the 24-battery group is higher than the 35 groups. Basically, the 24-battery group is more powerful than the battery group of 35.

Conclusion

You know, different applications call for specific battery sizes. Though the battery group size is a crucial aspect of vehicle ownership, it is often overlooked.

While replacing the battery of your applications, you should consider the BCI battery group size chart, EN, or DIN cross reference chart. Besides defining the physical dimensions of different sizes of batteries, BCI provides performance ratings & configuration diagrams.

You can visit the BCI battery Replacement Data Book to see the diagram or the full details of the batteries. I hope it will be a great help to you.